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Stock-Based Compensation - Additional Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 0 Months Ended 3 Months Ended 3 Months Ended 0 Months Ended 3 Months Ended 0 Months Ended 3 Months Ended
Jan. 31, 2014
Jan. 31, 2013
Jan. 27, 2014
2011 Management Incentive Plan [Member]
Jan. 09, 2014
2011 Management Incentive Plan [Member]
Directors
Jan. 31, 2014
2011 Management Incentive Plan [Member]
Apr. 30, 2011
2011 Management Incentive Plan [Member]
Jan. 31, 2014
2011 Management Incentive Plan [Member]
Stock Options [Member]
Jan. 09, 2014
2011 Management Incentive Plan [Member]
Employee Stock [Member]
Jan. 09, 2014
2011 Management Incentive Plan [Member]
Restricted Stock [Member]
Jan. 31, 2014
2011 Management Incentive Plan [Member]
Board of Director Members for October Two Thousand Eleven Option Grants [Member]
Maximum [Member]
Jan. 31, 2014
2011 Management Incentive Plan [Member]
Board of Director Members for October Two Thousand Eleven Option Grants [Member]
Maximum [Member]
Stock Options [Member]
Jan. 31, 2014
2011 Management Incentive Plan [Member]
Board of Director Members for April Two Thousand Eleven Option Grants [Member]
Minimum [Member]
Jan. 31, 2014
2011 Management Incentive Plan [Member]
Board of Director Members for April Two Thousand Eleven Option Grants [Member]
Minimum [Member]
Stock Options [Member]
Jan. 27, 2014
2011 Management Incentive Plan [Member]
Executive officers [Member]
Restricted Stock [Member]
Jan. 31, 2014
2005 Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Common stock shares authorized under ESPP           1,500,000                  
Number of non-employee directors       12                      
Restricted shares issued per non-employee director               1,750              
Total restricted shares issued to non-employee directors                 21,000            
Restricted stock closing price awarded to executive officers     $ 30.50 $ 32.49                      
Total restricted shares issued to executive officers                           10,774  
Stock options vesting period                     5 years   1 year    
Term of vested stock options                   5 years   2 years      
Weighted-average remaining life of stock options         6 years 4 months 24 days                   4 years 3 months 18 days
Exercisable stock options, weighted-average remaining contractual term         4 years 6 months                   4 years
Stock-based compensation expense $ 93 $ 116         $ 100